Quantification Strategies in real-time · PDF fileQuantification strategies in real-time...
Transcript of Quantification Strategies in real-time · PDF fileQuantification strategies in real-time...
![Page 1: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/1.jpg)
Quantification strategies in real-time RT-PCRwith special focus on RNA quality,
relative expression and data normalisation
qPCR Satellite SymposiumBio City Leipzig, 10 - 11th March 2005
PD Dr. Michael W. PfafflPhysiology - WeihenstephanCenter of Life and Food SciencesTechnical University of MunichWeihenstephaner Berg 385350 Freising-Weihenstephan; [email protected]
![Page 2: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/2.jpg)
Genotype -> Phenotype -> Function
DNA => pre-mRNA => mRNA => Protein => Function↓ ↓ ↓
Transcription Splicing Translationpost-translatoric modifications
Genom Transcriptome Proteome Metabolome& Splicome
![Page 3: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/3.jpg)
TranscriptomeRNA content of a cellT.A. Brown, GENOMES 2nd Edition
• ribosomal RNA rRNA 80-85% ( 5S, 18S und 28S )• transfer RNA tRNA 10-15%• messenger RNA mRNA 2% (1-5%) ( ∅ length 1930 bases)
• high abundant < 100 genes > 10,000 copies/cell• intermediate abundant ~ 500 - 1,000 genes 200 - 400 copies/cell• low abundant ~ 27,000 genes < 10 - 50 copies/cell
• RNA quantity & RNA quality
![Page 4: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/4.jpg)
Quantification Strategies in real time qRT-PCRM.W. Pfaffl, BioSpektrum 2004 (Sonderausgabe PCR)
relative quantificationabsolute quantification
external calibration curve
one color detectionsystem
SYBR Green I
external calibration curve
two color detectionsystem
e.g. Probes, ROX
external calibration
curve withoutany referenece
gene
normalisationvia one
reference gene
via reference gene index
>3 HKG
external calibration curve
• RT-PCR product
• plasmid DNA
• in vitro transcribed RNA
• synthetic DNA Oligos
• synthetic RNA Oligos
without real-time PCR efficiency correction
2 (-∆∆ CP) REST, qGeneLC software
with real-time PCR efficiency correction
ROXROX
![Page 5: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/5.jpg)
Quantification strategies in real-time RT-PCR
Absolute quantification using calibration curves
• recombinant DNA (recDNA) calibration curve (Pfaffl & Hageleit, Biotechnol.Lett. 2001)
• recombinant RNA (recRNA) calibration curve (Pfaffl & Hageleit, Biotechnol.Lett. 2001)
• calibration curve using a synthetic DNA oligo-nucleotide (Bustin, JME 2000)
• calibration curve using a synthetic RNA oligo-nucleotide (Bustin et al. 2000)
• calibration curve using a purified RT-PCR product (Einspanier et al. 1999)
• „Copy & Paste“ of previously performed calibration curves (LC software)
![Page 6: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/6.jpg)
• Calibration curve using a purified RT-PCR product or a synthetic ss/ds oligo-nucleotidetwo-step RT-PCRadvantages: quick, highly defined DNA content for the synthetic oligodisadvantages: instable, “often problems with re-amplification”, „short“ templates
Absolute quantification using calibration curves
• Calibration curve using a recombinant DNA (recDNA), e.g. plasmid DNAtwo-step RT-PCRadvantages: very stabile, no problems with re-amplification, „mimic of mRNA“disadvantages: cloning, linearization and purification of recDNA
• Calibration curve using a recombinant RNA (recRNA)one-step RT-PCR => recRNA and native mRNA undergoing RT and PCR in paralleladvantages: mimics the natural mRNA situation best (recRNA = native mRNA) disadvantages: very instable recRNA, complicate cloning, linearization,
purification of recRNA, storage problems, reproducibility (???)=> storage of recRNA !!!
• „Copy & Paste“ of previously performed calibration curves (e.g. LightCycler Software)advantages: very easy and very high reproducibility (at least for the calibration curve)disadvantages: do not covers variations in real RT-PCR experiment: RNA quality, slope,
qPCR efficiency ??? batch to batch variations, etc. => truth ???
![Page 7: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/7.jpg)
ER-alpha intra-assay variation CV = 18.7% (n = 3)
input ss cDNA molecules
1.65 e+91.65 e+81.65 e+71.65 e+61.65 e+51.65 e+41.65 e+3
dete
cted
mol
ecul
es
1e+3
1e+4
1e+5
1e+6
1e+7
1e+8
1e+9
1e+10 31.4% 14.4% 7.3% 7.9% 33.6% 13.7% 22.8%
input ss cDNA molecules
1.65 e+91.65 e+81.65 e+71.65 e+61.65 e+51.65 e+41.65 e+3
dete
cted
mol
ecul
es
1e+3
1e+4
1e+5
1e+6
1e+7
1e+8
1e+9
1e+10 41.2% 31.9% 46.2% 20.6% 15.1% 21.4% 23.8%
ER-alpha inter-assay variation CV = 28.6% (n = 7)
ERα intra-assay & inter-assay variationvariation on the basis of detected molecules using a recombinant plasmid DNA calibration curveintra-assay variation: within one runinter-assay variation: between different runs
![Page 8: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/8.jpg)
Validation: absolute quantification of steroid receptors
25.7% (n = 4)29.7% (n = 4)28.6% (n = 4)24.3% (n = 7)inter-assay variation
83.5[ 82.9 ]
83.983.883.183.5
[ 87.9 ]89.0
[ 89.9 ]90.190.590.2
86.085.0
--85.385.486.0
85.484.485.085.5
--84.5
Species specific Tmelt (°C)Homo sapiens
Rattus norvegicusCallithrix jacchus (primate)
Bos taurusOvis ariesSus scrofa
5.7% (n = 4)17.6% (n = 4)18.7% (n = 4)31.2% (n = 3)intra-assay variation
93.9%81.3%81.2%90.7%PCR efficiency
760 – 7.60*109
molecules(r = 0.998)
106 - 1.06*1010
molecules(r = 0.996)
165 - 1.65*109
molecules(r = 0.995)
120 - 1.20*1010
molecules(r = 0.998)
quantification range(test linearity)
760 molecules106 molecules165 molecules120 moleculesquantification limit
14 molecules10 molecules2 molecules12 moleculesdetection limit227 bp262 bp234 bp172 bpproduct length
PRERβERαAR
![Page 9: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/9.jpg)
ER-alpha [molecules/25 ng RNA]1e+3 1e+4 1e+5 1e+6
ER
-bet
a [m
olec
ules
/25
ng R
NA
]
1e+2
1e+3
1e+4
1e+5
Col 22 vs Col 26: 977883,75
Col 22 vs Col 26: 201818,75
Col 22 vs Col 26: 5421,71
Col 22 vs Col 26: 79348,75
Col 22 vs Col 26: 100003,75
Col 22 vs Col 26: 60479,88
Col 22 vs Col 26: 145339,88
Col 22 vs Col 26: 6035,36
Col 22 vs Col 26: 12027,5
Col 22 vs Col 26: 204646,5
Col 22 vs Col 26: 4061,57
Col 22 vs Col 26: 4591,62
Col 22 vs Col 26: 1535,57
Col 22 vs Col 26: 10212,38
Col 22 vs Col 26: 4160,5
ratio = 1
uterusliverlunglongissimus dorsihind leg musclesshoulder musclesneck musclesheartspleenmammary glandrumenabomasumjejunumkidney medullakidney cortex
Estrogen receptors (ERα & ERβ) expression pattern in cattle tissues
Pfaffl et al., APMIS 2001
![Page 10: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/10.jpg)
Relative QuantificationThe mRNA expression is relative to WHAT ???
• relative to a non treated control
• relative to a time point zero
• relative to another gene of interest
• relative to the mean expression of a target gene
• relative to an universal calibration curve
• relative to the expression of one constant expressed HKGGAPDH, tubulins, various actins, albumins, cyclophilin, micro-globulins, histone subunits, ribosomal units (18S or 28S rRNA), ………….etc.
• relative to a HKG Index containing more HKGs (> 3)geNorm (Vandesompele et al., Genome Biology, 2002)BestKeeper (Pfaffl et al.; Biotechnology Letters 2004)Normfinder (Andersen et al., Cancer Research 2004)statistical modeling (Szabo et al., Genome Biology 2004)
• etc. ???
![Page 11: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/11.jpg)
Normalisation strategiesAccording to known amounts of extracted RNA
(RIN quality check, molecules/ng RNA; ag transcript/ng RNA)
According to mass or volume of extracted tissue(molecules/mg tissue; ag transcript/mg tissue; transcript/cells)
According to one known and NOT regulated HKGGAPDH, tubulins, actins, albumins, cyclophilin, micro-globulins, histone subunits, ribosomal units (18S or 28S rRNA),.............
According to a HKG Index containing more HKGs (> 3)geNorm (Vandesompele et al. 2002, Genome Biology)Accurate normalization of real-time quantitative RT-PCR data by geometric veraging of multiple internal control genes.
BestKeeper (Pfaffl et al. 2004; Biotechnology Letters 2004)Determination of most stable housekeeping genes, differentially regulated target genes and sample integrity: BestKeeper Excel based tool using pair-wise correlations.
Normfinder (Andersen et al., 2004 Genome Biology)Normalization of Real-Time Quantitative Reverse Transcription-PCR Data: A Model-Based Variance Estimation Approach to Identify Genes Suited for Normalization.
Statistical modeling for selecting housekeeper genes(Szabo et al. 2004, Genome Biology)
![Page 12: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/12.jpg)
Relative Quantification in real time qRT-PCR
without real-time PCR efficiency correction
2 (-∆∆ CP)
relative quantification
external calibration
curve withoutany referenece
gene
normalisationvia one
reference gene
via reference gene index
>3 HKG
ROX
![Page 13: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/13.jpg)
“Delta-delta method” for comparing relative expression results between treatments in real-time PCR
presented by PE Applied Biosystems (Perkin Elmer, Forster City, CA, USA)
ABI Prism 7700 Sequence detection System User Bulletin #2 (2001)
Relative quantification of gene expression.http://docs.appliedbiosystems.com/pebiodocs/04303859.pdf
expression ratio = 2
- [ ∆CP sample - ∆CP control]
- ∆∆CPexpression ratio = 2
Livak KJ, Schmittgen TD. (2001) Analysis of Relative Gene Expression Data Using Real-Time Quantitative PCR and the 2 (- delta deltaC(T)) method.Methods. 2001 25(4): 402-408.
![Page 14: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/14.jpg)
“Delta-delta method” for comparing relative expression results between treatments in real-time PCR
presented by ABI (Applied Biosystems Inc.)
assumptions: E = 2 & ∆CP is constant over a wide range
![Page 15: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/15.jpg)
![Page 16: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/16.jpg)
expression relative to the time point zero & normalised by a HKG:TNFα mRNA expression in cultured leukocytes after LPS stimulation:
white blood cells [WBC] vs. somatic milk cells [SMC] isolated blood monocytes vs. isolated milk macrophages
PCR Efficiency = 2 n = 6 mean ± sem
TNFalpha
Time[h]
0 2 4 6 8
TNFa
lpha
[del
taC
P]
0
2
4
6
8 WBCSomatic Cells
***
***
******
***
+++
++
+
+
******
***
***
*
+++
+++
TNFalpha
Time[h]
0 2 4 6 8
TNFa
lpha
[del
taC
P]
0
2
4
6
8 MonocytesMacrophages
*** +***
++ ******
+++***
***+++
***
+++ ***
+++
Prgomet et al., 2004
![Page 17: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/17.jpg)
Relative Quantification in real time qRT-PCR
without real-time PCR efficiency correction
2 (-∆∆ CP) REST, qGeneLC software
with real-time PCR efficiency correction
relative quantification
external calibration
curve withoutany referenece
gene
normalisationvia one
reference gene
via reference gene index
>3 HKG
ROX
![Page 18: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/18.jpg)
Tissue “background” interfere with real-time PCR efficiency and amplification fidelity
IGF-1 mRNA amplification in three cattle tissues
liver
m. splenius m. gastrocnemius
![Page 19: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/19.jpg)
Efficiency variation in real-time RT-PCR
Roche Diagnostics, LC rel. Quantification software, March 2001
![Page 20: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/20.jpg)
PCR inhibitors:Hemoglobin, Urea, Heparin
Organic or phenolic compoundsGlycogen, Fats, Ca2+
Tissue matrix effectsLaboratory items, powder, etc.
PCR enhancers:DMSO, Glycerol, BSA
Formamide, PEG, TMANO, TMAC etc.Special commercial enhancers:
Gene 32 protein, Perfect Match, Taq Extender, AccuPrime, E. Coli ss DNA binding
real-time PCRefficiency
NA degradation = RIN
PCR reaction components
DNA concentration
tissue degradation
unspecificPCR products
hardware:PCR platform & cups
lab management DNA dyes cycle conditions
![Page 21: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/21.jpg)
Relative quantification of a target gene versus areference gene (housekeeping gene)
Single data (n = 1) e.g. array results:
Etarget∆CPtarget (control - sample)
relativeexpression =
Ereference∆CPref (control - sample)
Pfaffl, Nucleic Acids Research 2001
relativeexpression
( Eref )CPSample
( Etarget )CPSample
÷( Eref )
Calibrator
( Etarget )CPCalibrator
=
Roche Diagnostics, LC relative Quantification software, March 2001
CP
![Page 22: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/22.jpg)
Relative quantification of a target gene versus areference gene (housekeeping gene)
single data (n = 1) e.g. array results:
Etarget∆CPtarget (control - sample)
relativeexpression =
Eref∆CPref (control - sample)
Pfaffl, Nucleic Acids Research 2001
multiple data (1 < n < 100) e.g. experimental groups via REST-XL©:
Etarget∆CPtarget (MEAN control – MEAN sample)
relativeexpression =
Eref∆CPref (MEAN control – MEAN sample)
Pfaffl et al., Nucleic Acids Research 2002
![Page 23: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/23.jpg)
http://rest.gene-quantification.info
![Page 24: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/24.jpg)
Influence of total RNA quality, quantity and purity on qRT-PCR resultstotal RNA extracted bovine WBC analyzed in Bioanalyzer 2100
ladder RIN: 9.5
RIN: 5.6 RIN: 2.8
V. Walf, S. Huch, MW. Pfaffl, 2005
![Page 25: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/25.jpg)
RIN in different bovine tissues (Box Plot)R
IN
0
2
4
6
8
10
liver (n = 22)heart (n = 17)spleen (n = 17)lung (n = 22)rumen (n = 23)reticulum (n = 26)omasum (n = 17)abomasum (n = 17)ileum (n = 17)jejunum (n = 20)colon (n = 19)caecum (n = 16)mes. lymphnode (n = 26)
S. Fleige & MW. Pfaffl, 2005
![Page 26: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/26.jpg)
RIN liver 1st and 2nd extraction
0
2
4
6
8
10
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
sample number
RIN
Leber 1.Extraktion Leber 2.Extrakion
![Page 27: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/27.jpg)
Enzymatic or UV degradation of tissue extracted total RNA
RIN 10.0 9.2 9.2 8.6 8.1 7.8 7.2 6.7 6.0 5.0 4.4 4.0
![Page 28: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/28.jpg)
RIN 9.5 RIN 2.8
bovine WBC total RNA
∆ CP
![Page 29: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/29.jpg)
Influence of total RNA quality on qRT-PCR results
y = -0,206x + 7,6396R2 = 0,5363
y = -0,887x + 21,398R2 = 0,7165
y = -0,7211x + 27,077R2 = 0,7682
0,0
5,0
10,0
15,0
20,0
25,0
30,0
0 1 2 3 4 5 6 7 8 9 10
RNA Integrity Number
CP
= T
ake
Off
Po
int
28S
beta actin
IL-1
![Page 30: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/30.jpg)
bovine ileum total RNA
28S18S
β-ActinIL-1β
![Page 31: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/31.jpg)
bovine ileum: CP = TOP
y = -0,2036x + 8,6557R2 = 0,7612
y = -2E-15x + 6,00R2 = 1,0
y = -0,1461x + 13,565R2 = 0,4903
R2 = 0,8119
0,0
5,0
10,0
15,0
20,0
25,0
0 1 2 3 4 5 6 7 8 9 10
RNA Integrity Number
CP
= Ta
ke O
ff Po
int
18S 28S beta-actin IL-1 Linear (18S) Linear (28S) Linear (beta-actin) Linear (IL-1)
18S
28S
beta actin
IL-1
CP = constant in relative quantification
y = -0,2583x + 21,787∆
28S n.s.Interleukin-1beta P < 0.001
beta-Actin P < 0.0118S P < 0.001
![Page 32: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/32.jpg)
Influence of total RNA quality on qRT-PCR CP (Ct)IL-1: Crossing Point
14,0
16,0
18,0
20,0
22,0
24,0
26,0
28,0
30,0
32,0
34,0
0 1 2 3 4 5 6 7 8 9 10RNA Integrity Number
Cro
ssin
g P
oint
Reticulum (E) Lymph nodes (E) Lymph nodes (P) Colon (P) Lung (E)Corpus luteum (P) Caecum (P) Spleen (P) Abomasum (P)
![Page 33: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/33.jpg)
Influence of total RNA quality on qRT-PCR efficiency
28S: Amplification
1,5
1,6
1,7
1,8
1,9
2,0
0 1 2 3 4 5 6 7 8 9 10RNA Integrity Number
PCR
Eff
icie
ncy
Reticulum (E) Lymph nodes (E) Lymph nodes (P) Colon (P) Lung (E)Corpus luteum (P) Caecum (P) Spleen (P) Abomasum (P)
![Page 34: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/34.jpg)
Advantages:• each sample derived from identical total RNA (one-step quantification) or cDNA
source (two-step quantification) = identical inhibitors and enhancers• tissue specific matrix effects are given, but not existent in relative quantification• total RNA quantity, RT efficiency and cDNA quantity are minor relevant • effect of total RNA quality and influence on qRT-PCR have to be tested in detail• optimized assays are highly reproducibility (variations only given by researcher, kit,
robot and real-time platform)• each sample will be normalised with HKG or better by a HKG INDEX• no production of a calibration curve: e.g. cloning, linearization or purification of
calibration curve material• no data conversion: molecules, concentrations or molarities• => direct procedure: measured data were inserted in mathematical model• => relative quantification by software applications, e.g. qGene, REST, LightCycler• => automatic calculation => bio-informatics session
Disadvantages:• No information about the effective molecule concentration present in the tissues
(molecules/mg tissue; molecules/ng RNA; molecules /cell, etc.)
Relative quantification using efficiency corrected calculation
![Page 35: Quantification Strategies in real-time · PDF fileQuantification strategies in real-time RT-PCR ... data normalisation qPCR Satellite Symposium Bio City Leipzig, 10 - 11th March 2005](https://reader031.fdocuments.us/reader031/viewer/2022011722/5a77ccda7f8b9a0d558e336a/html5/thumbnails/35.jpg)
Thank you team !Thank you for your attention !